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Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-throu

From: Vitaly Kuznetsov
Subject: Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode
Date: Tue, 29 Jan 2019 16:20:33 +0100

"Dr. David Alan Gilbert" <address@hidden> writes:

> I'm not sure what the equivalent bear traps are in the Hyper-V world,
> but I'd be surprised if there weren't any; for example what happens
> when someone upgrades one of their hosts to some minor version that
> adds/removes a feature?

Here we're talking about Hyper-V emulation in KVM, features only get
added there, but even if it gets removed it will be detected by libvirt ...

> Also, how does libvirt figure out that the features are actually the
> same - does it need a bunch of detection code?

... as I *think* it compares Feature CPUID words (and all Hyper-V
features which we enable with hv-all are there).


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